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XEYE6 TIL that One World Trade Center, the tallest building in North America, is 1,776 feet. It's height is a reference to the year the Declaration of Independence was signed.
5YLDD TIL that the tallest building in the world is the Burj Khalifa in Dubai. It stands at 2,717 ft. / 828 m. tall and has 163 floors.
oBwJr TIL that by mass, polonium-210 is nearly 250,000 times more toxic than hydrogen cyanide